Closed
Description
The following code
fn main() -> Result<(), std::string::ParseError> {
let x = 0;
match x {
1 => {
let property_value_as_string = "a".parse()?;
}
2 => {
let value: &bool = unsafe { &42 };
}
};
Ok(())
}Will generate the following error under nightly (rustc 1.33.0-nightly):
Compiling playground v0.0.1 (/playground)
error[E0308]: mismatched types
--> src/main.rs:9:41
|
6 | let property_value_as_string = "a".parse()?;
| ------------ expected because of this statement
...
9 | let value: &bool = unsafe { &42 };
| ^^^ expected bool, found integer
|
= note: expected type `&bool`
found type `&{integer}`
Which is incorrect (and confusing!).
stable produce the correct message:
error[E0308]: mismatched types
--> src/main.rs:9:41
|
9 | let value: &bool = unsafe { &42 };
| ^^^ expected bool, found integral variable
|
= note: expected type `&bool`
found type `&{integer}`
and removing either the ? or the unsafe { } will make nightly generate a correct message as well.
Meta
rustc --version --verbose (Windows):
rustc 1.33.0-nightly (e2f221c75 2019-01-15)
binary: rustc
commit-hash: e2f221c75932de7a29845c8d6f1f73536ad00c41
commit-date: 2019-01-15
host: x86_64-pc-windows-msvc
release: 1.33.0-nightly
LLVM version: 8.0
and
rustc --version --verbose (macOS):
rustc 1.33.0-nightly (e2f221c75 2019-01-15)
binary: rustc
commit-hash: e2f221c75932de7a29845c8d6f1f73536ad00c41
commit-date: 2019-01-15
host: x86_64-apple-darwin
release: 1.33.0-nightly
LLVM version: 8.0